Electrical apparatus



ELECTRICAL APPARATUS Filed March 29, 1944 Patented Nov. 13, 1945 ELECTRICAL APPARATUS Charles E. Bennett, Ridgewood, N. J., assgnor to The Okonite-Callender Cable Company, Incorporated, Paterson, N. J.

Jersey a corporation of New Application March 29, 1944, Serial No. 528,518

3 Claims. (Cl. 174-718) This invention relates to an improved construction for terminating electric cables.

My construction is particularlyv4 adapted for terminating electric cables of the type wherein the cable comprises insulated conductors enclosed in a suitable enclosure such as a pipe line which. is iilled with oil maintained under superatmospheric pressure of the order of from 125 to 300 lbs. per square inch.

It is an object of my invention to provide apparatus for terminating cables whereby the number of expensive porcelain bushings ordinarily employed necessary for the job is reduced.

The accompanying drawing shows an embodiment of my invention in part sectional elevation.

Referring to the drawing in detail; 2 designates one conductor of a cable to be terminated and 4 the riser pipe therefor. The cable illustrated is of the type wherein the conductors which are insulated with oil permeable insulation, such as paper tape, for instance, are drawn into a pipe line filled with oil maintained under superatmospheric pressure, say from 125 to 300 lbs. per square inch.

6 designates the casing of electrical apparatus to which the cable is to be connected. This electrical apparatus may be a transformer, oil switch, circuit breaker, etc.

8 designates a housing removably secured to the side of the casing 6 and extending over the top of the same, to provide a cover for the same.

'I'he insulated cable conductor 2 passes from the riser 4 upwardly into the housing 8 through the bottom of the housing. A tube lll of porcelain or other suitable insulating material is mounted in the base of the housing 8 and extends from below the housing through the base and upwardly into the housing almost to the upper end of the cable conductor. This tube is open at its lower end and the cable conductor is led up into the tube so as to provide for maintaining the conductor under superatmospheric pressure to its extremity.

'I'he upper end of the insulating tube I0 is sealed by metal connector I2 to the lower end of which the bared upper end of the conductor 2 is rigidly secured; the upper end of this connector is rigidly attached to one end of instrument lead I4, the opposite end of this lead extending into the casing 6, where it is `connected to the electrical apparatus to which the cable is to be terminated, and which, as above noted, may be a transformer, oil switch, circuit breaker, etc. The lead I4, it will be appreciated, is insulated with oil permeable insulation such as paper tape, for example.

I6 designates a ashover tube of suitable insulating material which surrounds the cable and the transformer lead where the two are connected together, and is to prevent ashover to the metal housing 8.

The housing 8 and the casing 6 are filled with oil. This oil, however, as distinguished from that in which the cable is immersed, is merely at atmospheric pressure.

It will be seen from all of the foregoing that the present invention provides a construction for terminating cables whereby the number of bushings required for a given installation is cut in half. This is of material advantage, not only from installation and service points of View, but from an economic point of view.y Just by way of emphasis, it might be noted that the usual method of terminating a conductor of this type of cable to a transformer would require a bushing at the end of the cable and another bushing at the transformer housing. On high tension work these bushings might be seven feet high, weigh as much as 2000 pounds and cost in the neighborhood of $2000.00.

It will be understood also that my construction is of material advantage when making repairs or alterations in that access may be had to the tube I0 and to the connection between the cable conductor 2 and the instrument lead I4, by simply removing the oil from the housing 8 and then removing the housing without the necessity of disturbing the oil in the instrument casing 6 at all.

It is to be understood that changes may be made in the details of construction and arrangement of parts above described without departing from the spirit and scope of my invention.

What I claim is:

1. Electrical apparatus comprising in combination an electrical instrument casing, a housing attached to the exterior of said casing, a tube of insulating material extending into said housing, an insulated cable conductor extending into said tube, through one end thereof, a connector sealing the opposite end of said tube, an instrument lead extendingr from the interior of said casing along the interior of said housing to said connector by which it is attached to the cable conductor, oil permeable insulation for the cable conductor and instrument lead, oil under superatmospheric pressure surrounding said conductor to the sealed end of the said tube, and additional oil filling said housing and casing.

2. Electrical apparatus comprising in combination an electrical instrument casing, a housing attached to the exterior of said casing, a tube of insulating material extending into said housing, a riser pipe, a conductor insulated With oil permeable insulation projecting from said riser pipe into said tube, a connector for sealing the tube at the end opposite the entry of said conductor, said conductor being secured to said connector, an instrument lead insulated with oil permeable insulation extending from the interior of the casing and along the interior of the housing to said connector by which it is attached to said conductor, oil under superatmosp-heric Vpressure iilling the riser pipe and said insulating' tube, and a body of oil under atmospheric pressure filling said housing and casing.

3. Electrical apparatus comprising in combination an electrical instrument casing, a housing attached to the exterior of said casing, a tube of insulating material extending into said housing, a riser pipe, a conductor insulated with oil permeable insulation projecting frorn said riser pipe into said tube, a connector for sealing the tube at the end opposite the entry of said conductor, said conductor being secured to said connector, an instrument lead insulated with oil permeable insulation extending from the interior of the casing and along the interior of the housing to said connector by which it is attached to said conductor, a ashover tube surrounding the cable conductor and instrument lead at said connector, oil under superatmospheric pressure filling the riser pipe and said insulating tube, and a body of oil under atmospheric pressure llin-g said housing and casing.

' CHARLES E. BENNETT. 

